Built-in Types Examples

Using Built-in Types.

Using Built-in Types.

RTI Connext provides a set of simple data types for you to use with the topics in your application (see Built-in Types)

If you use these built-in types you do not have to generate any code using rtiddsgen.

• StringTopicType has one field, data, of type dds::core::string.

      dds::domain::DomainParticipant participant(0);
   
      dds::topic::Topic<dds::core::StringTopicType> topic(participant, "MyTopic");
   
      dds::pub::DataWriter<dds::core::StringTopicType> writer(
         dds::pub::Publisher(participant), topic);
   
      // Create a StringTopicType sample with data = "Example Data"
      dds::core::StringTopicType sample("Example Data");
   
      // Change the value of data 
      sample.data("New Data Value");
   
      // Write the sample
      writer.write(sample);
   
      // You can also write a sample like this, making use of an implicit 
      // conversion between string and StringTopicType
      writer.write("Example Data 2");

  
  
• KeyedStringTopicType has two fields, key and value, both of type dds::core::string.

      dds::domain::DomainParticipant participant(0);
   
      dds::topic::Topic<dds::core::KeyedStringTopicType> topic(
         participant, "MyTopic");
   
      dds::pub::DataWriter<dds::core::KeyedStringTopicType> writer(
         dds::pub::Publisher(participant), topic);
   
      // Create a StringTopicType sample with data = "Example Data"
      dds::core::KeyedStringTopicType sample("Example Key", "Example Value");
   
      // Change the value of value and key
      sample.key("New Key");
      sample.value("New Value");
   
      // Write the sample
      writer.write(sample);

  
  
• BytesTopicType represents an array of bytes:

      dds::domain::DomainParticipant participant(0);
   
      dds::topic::Topic<dds::core::BytesTopicType> topic(participant, "MyTopic");
   
      dds::pub::DataWriter<dds::core::BytesTopicType> writer(
          dds::pub::Publisher(participant), topic);
   
      // Create a BytesTopicType sample with some data
      std::vector<uint8_t> byte_vector;
      byte_vector.push_back(100);
      byte_vector.push_back(200);
      dds::core::BytesTopicType sample(byte_vector);
   
      // You can modify it with the operator[]:
      sample[0] = 150;
   
      // Write the sample
      writer.write(sample);
   
      // You can also write the std::vector directly, using the implicit
      // BytesTopicType constructor:
      writer.write(byte_vector);